A method and apparatus to record data on an optical recording medium include generating a recording waveform having an erase pattern comprising a multi-pulse having a high level which is higher than an erase power level and a low level which is lower than the erase power level. A power level of a leading one of the multi-pulse of the erase pattern and a power level between an end of the erase pattern and a start point of a leading pulse of a recording pattern are controlled to be the low level and the high level, respectively, the high level and the high level, respectively, the high level and the low level, respectively, or the low level and the low level, respectively.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An apparatus to record NRZI data on an optical recording medium, the apparatus comprising: a recording waveform generator to generate a recording waveform having an erase pattern comprising a multi-pulse having a first level and a second level, wherein a power level of a period between a point where the NRZI data changes from a low level to a high level and a start point of a first pulse of a recording pattern is set to the first level of the multi-pulse or the second level of the multi-pulse, based on pulse information stored on the optical recording medium; and a pickup unit to radiate a light onto the optical recording medium according to the generated recording waveform to form a mark or a space; wherein the pulse information stored on the optical recording medium comprises: power level information regarding the power level of the period between the point where the NRZI data changes from the low level to the high level and the start point of the first pulse of the recording pattern; and duration information regarding a duration of the period between the point where the NRZI data changes from the low level to the high level and the start point of the first pulse of the recording pattern.
2. The apparatus of claim 1 , wherein the recording waveform further comprises a cooling pulse concatenating the erase pattern and another recording pattern preceding the erase pattern.
3. The apparatus of claim 1 , wherein: the pulse information stored on the optical recording medium further comprises power level information regarding a power level of a leading pulse of the multi-pulse of the erase pattern; and the power level of the leading pulse of the multi-pulse of the erase pattern is set to the first level of the multi-pulse or the second level of the multi-pulse, based on the pulse information stored on the optical recording medium.
4. An optical recording medium comprising: pulse information for use in generating a recording waveform to form a mark and a space on the optical recording medium in response to NRZI data, the recording waveform having a recording pattern and an erase pattern comprising a multi-pulse having a first level and a second level; wherein: the pulse information comprises: power level information regarding a power level of a period between a point where the NRZI data changes from a low level to a high level and a start point of a first pulse of the recording pattern; and duration information regarding a duration of the period between the point where the NRZI data changes from the low level to the high level and the start point of the first pulse of the recording pattern; and the power level of the period between the point where the NRZI data changes from the low level to the high level and the start point of the first pulse of the recording pattern is set to the first level of the multi-pulse or the second level of the multi-pulse, based on the pulse information.
5. The optical recording medium of claim 4 , wherein: the pulse information further comprises information regarding a power level of a leading pulse of the multi-pulse of the erase pattern; and the power level of the leading pulse of the multi-pulse of the erase pattern is set to the first level of the multi-pulse or the second level of the multi-pulse based on the pulse information.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 9, 2006
April 6, 2010
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